CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 20,387	$ 21,228
Other comprehensive income (loss):
Foreign currency translation adjustments	(254)	(12)
Unrealized gains (losses) on cash flow hedges:
Unrealized cash flow hedge gains (losses) arising during the period	954	(2,838)
Net (gains) losses reclassified into income for revenue hedges	(160)	(3,538)
Net (gains) losses reclassified into income for cost of revenue hedges	727	773
Net unrealized gains (losses) on cash flow hedges	1,521	(5,603)
Unrealized holding gains (losses) during the period	314	(82)
Aggregate income tax benefit (expense) of the above items	(124)	132
Other comprehensive income (loss)	1,457	(5,565)
Comprehensive income	$ 21,844	$ 15,663